package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.PasswordConstant;
import com.sky.constant.StatusConstant;
import com.sky.context.BaseContext;
import com.sky.dto.EmployeeDTO;
import com.sky.dto.EmployeeLoginDTO;
import com.sky.dto.EmployeePageQueryDTO;
import com.sky.entity.Employee;
import com.sky.exception.AccountLockedException;
import com.sky.exception.AccountNotFoundException;
import com.sky.exception.PasswordErrorException;
import com.sky.mapper.EmployeeMapper;
import com.sky.result.PageResult;
import com.sky.service.EmployeeService;
import com.sky.vo.EmployeeVO;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.util.DigestUtils;

import java.nio.charset.StandardCharsets;
import java.time.LocalDateTime;
import java.util.ArrayList;
import java.util.List;
import java.util.function.Function;
import java.util.stream.Collectors;

@Service
public class EmployeeServiceImpl implements EmployeeService {

    @Autowired
    private EmployeeMapper employeeMapper;

    /**
     * 员工登录
     *
     * @param employeeLoginDTO
     * @return
     */
    public Employee login(EmployeeLoginDTO employeeLoginDTO) {
        String username = employeeLoginDTO.getUsername();
        String password = employeeLoginDTO.getPassword();

        //1、根据用户名查询数据库中的数据
        Employee employee = employeeMapper.getByUsername(username);

        //2、处理各种异常情况（用户名不存在、密码不对、账号被锁定）
        if (employee == null) {
            //账号不存在
            throw new AccountNotFoundException(MessageConstant.ACCOUNT_NOT_FOUND);
        }

        //密码比对
        password = DigestUtils.md5DigestAsHex(password.getBytes(StandardCharsets.UTF_8));
        if (!password.equals(employee.getPassword())) {
            //密码错误
            throw new PasswordErrorException(MessageConstant.PASSWORD_ERROR);
        }

        if (employee.getStatus() == StatusConstant.DISABLE) {
            //账号被锁定
            throw new AccountLockedException(MessageConstant.ACCOUNT_LOCKED);
        }

        //3、返回实体对象
        return employee;
    }

    /**
     * 添加员工
     * @param employeeDTO
     */
    @Override
    public void save(EmployeeDTO employeeDTO) {
        //构造一个employee对象
        Employee employee = new Employee();
        //将dto的成员变量的值复制到employee中
        BeanUtils.copyProperties(employeeDTO,employee);
        //设置密码
        String md5Pass = DigestUtils.md5DigestAsHex(PasswordConstant.DEFAULT_PASSWORD.getBytes(StandardCharsets.UTF_8));
        employee.setPassword(md5Pass);
        //设置状态
        employee.setStatus(StatusConstant.ENABLE);

        employeeMapper.save(employee);
    }

    /**
     * 员工分页查询
     * @param pageQueryDTO
     * @return
     */
    @Override
    public PageResult page(EmployeePageQueryDTO pageQueryDTO) {
        PageHelper.startPage(pageQueryDTO.getPage(),pageQueryDTO.getPageSize());
        Page page = employeeMapper.page(pageQueryDTO.getName());

        List<EmployeeVO> list = (List<EmployeeVO>) page.getResult().stream()
                .map(employee -> {
                    EmployeeVO vo = new EmployeeVO();
                    BeanUtils.copyProperties(employee,vo);
                    return  vo;
                })
                .collect(Collectors.toList());

        return new PageResult(page.getTotal(),list);
    }

    /**
     * 启用禁用员工
     * @param employee
     * @return
     */
    @Override
    public void update(Employee employee) {
        employeeMapper.update(employee);
    }

    /**
     * 根据id查询员工信息
     * @param id
     * @return
     */
    @Override
    public Employee findById(Long id) {
        return employeeMapper.findById(id);
    }

}
